Display Panel Voltage-Matched Pads for Corrosion Prevention
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Solution Overview
Problem
Corrosion occurs in the pads of a display device due to potential differences between neighboring pads, leading to increased resistance, disconnection, and poor bonding, which deteriorates the operational reliability.
Innovation Solution
A display device with a display panel and non-connection pads adjacent to connection pads, where a main controller sets an individual voltage based on driving signal voltages and applies it to the non-connection pads, using switches to control electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple pads with different voltages are arranged adjacent to each other, then the display device can function properly with multiple driving signals, but corrosion occurs due to potential differences between neighboring pads
Solution Approach 1:
The patent introduces non-connection pads that are not electrically connected to signal lines and sets their voltage to match adjacent connection pads. This creates equipotential regions between neighboring pads with different signal voltages, eliminating potential differences that cause corrosion while preserving the ability to deliver multiple driving signals through connection pads.
2Reliability
If non-connection pads are added to prevent corrosion, then pad reliability improves, but device complexity increases
Solution Approach 1:
The patent segments the pad structure into two distinct types: connection pads that receive driving signals and non-connection pads that serve as voltage-matched intermediaries. This segmentation allows the system to address corrosion prevention through a dedicated structural element rather than complicating the signal transmission pads themselves.
Solution Approach 2:
Non-connection pads act as intermediary elements positioned between connection pads with different voltage levels. These intermediary pads are voltage-matched to one side, creating a stepped voltage transition that prevents corrosion without interfering with the primary signal transmission function of connection pads.
Data Source
AI summary
A display device includes a display panel having signal lines connected to one or more pixels, a plurality of connection pads provided to supply driving signals to the signal lines, one or more non-connection pads positioned to be adjacent to the plurality of connection pads and not connected to the signal lines, and a main controller for setting an individual voltage based on voltages of the driving signals and for applying a set individual voltage to the non-connection pad.